I finally got a RTS Prime. Right out of the package, the gray part second set of wheels are blocked by the gray fold down gas tanks and mudflaps part. I've tried adjusting the wheels and that gray part but it either doesn't look right or the wheels don't move. I've dremeled the gray part a little to get it to set flush with the back of the cab to no avail. Is it like this on all Primes or is it just mine? How do I fix this?